Starting the R/3 System Using Start Profiles 
Use
You can also start profiles to start your R/3 System.
Procedure
To start the R/3 System, maintain an extensive start profile for every system configuration you wish to use. You can then use this start profile to start all the system instances.
Alternatively, proceed as follows:

Your R/3 System must be set up for interactive work during daytime. The system must be optimized for your end users. At night and at weekends you want to set up the system to process background jobs and for maintenance purposes.
To facilitate reconfiguration, you simply define the required operation modes. When an operation mode switch occurs, the system can reconfigure itself in line with the selected operation mode.